wait_until.go

func WaitUntil(f func() bool, seconds int) {
	done := make(chan bool)
	go func() {
		time.Sleep(time.Duration(seconds) * time.Second)
		done <- true
	}()
	go func() {
		for {
			if f() {
				done <- true
			}
		}
	}()
	select {
	case <-done:
		return
	}
}